Cover plate and display device

Abstract

Provided is a cover plate. The cover plate includes a substrate, a first buffer layer and a second buffer layer. The substrate includes a first surface and a second surface, and the first surface faces a flexible display panel. The first buffer layer is laminated on the first surface, and an elastic modulus of the first buffer layer ranges from 10 MPa to 2 GPa. The second buffer layer is laminated on the second surface, and an elastic modulus of the second buffer layer ranges from 60 MPa to 7 GPa.

What is claimed is: 
     
         1 . A cover plate, wherein the cover plate is applicable to a flexible display panel, the cover plate comprising:
 a substrate comprising a first surface and a second surface opposite to each other, the first surface facing the flexible display panel;   a first buffer layer laminated on the first surface; and   a second buffer layer laminated on the second surface   wherein the cover plate further comprises:   a first elastic layer laminated on a side of the second buffer layer away from the substrate;   a first support layer laminated on a side of the first elastic layer away from the substrate;   a protective layer laminated on the side of the second buffer layer away from the substrate, wherein the protective layer is an outermost layer among all layers on the side of the second buffer layer away from the substrate; and   a first adhesive layer adhered between the protective layer and a layer adjacent to the protective layer,   wherein the protective layer comprises:   a second support layer laminated on a side of the first adhesive layer away from the substrate; and   a scratch-resistant layer laminated on a side of the second support layer away from the substrate,   wherein when temperature ranges from 15° C. to 35° C., a viscosity of the first adhesive layer is greater than 700 gf/inch, a creep coefficient of first adhesive layer is greater than 300%, and a restitution coefficient of the first adhesive layer is greater than 80%; and   when the temperature is less than −50° C., the viscosity of the first adhesive layer is less than 30 gf/inch, wherein the first adhesive layer is a pressure-sensitive adhesive layer.   
     
     
         2 . The cover plate according to  claim 1 , wherein
 the first buffer layer is any one of a flexible polyurethane (PU) layer, a polyimide (PI) layer, and a polymethyl methacrylate (PMMA) layer, or the first buffer layer is formed by laminating at least two of the flexible PU layer, the PI layer and the PMMA layer; and   the second buffer layer is any one of the flexible PU layer, the PI layer and the PMMA layer, or the second buffer layer is formed by laminating at least two of the flexible PU layer, the PI layer and the PMMA layer.   
     
     
         3 . The cover plate according to  claim 1 , wherein in a direction perpendicular to the first surface, a thickness of the first buffer layer ranges from 5 μm to 40 μm, and a thickness of the second buffer layer ranges from 5 μm to 40 μm. 
     
     
         4 . The cover plate according to  claim 1 , wherein the first elastic layer is a thermoplastic polyurethane (TPU) layer. 
     
     
         5 . The cover plate according to  claim 1 , wherein the first support layer is a polyethylene terephthalate (PET) layer. 
     
     
         6 . A display device, comprising a cover plate and a flexible display panel laminated in sequence, wherein the cover plate is applicable to the flexible display panel, and comprises:
 a substrate comprising a first surface and a second surface opposite to each other, the first surface facing the flexible display panel;   a first buffer layer laminated on the first surface; and   a second buffer layer laminated on the second surface,   wherein the cover plate further comprises:   a first elastic layer laminated on a side of the second buffer layer away from the substrate,   wherein the cover plate further comprises:   a first elastic layer laminated on a side of the second buffer layer away from the substrate;   a first support layer laminated on a side of the first elastic layer away from the substrate;   a protective layer laminated on the side of the second buffer layer away from the substrate, wherein the protective layer is an outermost layer among all layers on the side of the second buffer layer away from the substrate; and   a first adhesive layer adhered between the protective layer and a layer adjacent to the protective layer,   wherein the protective layer comprises:   a second support layer laminated on a side of the first adhesive layer away from the substrate; and   a scratch-resistant layer laminated on a side of the second support layer away from the substrate,   wherein when temperature ranges from 15° C. to 35° C., a viscosity of the first adhesive layer is greater than 700 gf/inch, a creep coefficient of first adhesive layer is greater than 300%, and a restitution coefficient of the first adhesive layer is greater than 80%; and   when the temperature is less than −50° C., the viscosity of the first adhesive layer is less than 30 gf/inch, wherein the first adhesive layer is a pressure-sensitive adhesive layer.   
     
     
         7 . The display device according to  claim 6 , further comprising:
 a second elastic layer laminated on a side of the flexible display panel away from the cover plate, wherein a tensile strength of the second elastic layer ranges from 5 MPa to 10 MPa.   
     
     
         8 . The display device according to  claim 7 , wherein
 the second elastic layer is any one of a thermoplastic polyurethane (TPU) elastomer rubber layer, a foam layer, a polyethylene terephthalate (PET) layer, a polyimide (PI) layer, and an optically clear adhesive (OCA) layer; or   the second elastic layer is formed by laminating at least two of the (TPU) elastomer rubber layer, the foam layer, the (PET) layer, the PI layer, and the OCA layer.   
     
     
         9 . The display device according to  claim 6 , wherein along a first direction, a length of the cover plate is greater than a length of the flexible display panel, the first direction being perpendicular to an extension direction of a bending line when the display device is bent, and the first direction being parallel to the first surface. 
     
     
         10 . The display device according to  claim 6 , wherein
 the first buffer layer is any one of a flexible polyurethane (PU) layer, a polyimide (PI) layer, and a polymethyl methacrylate (PMMA) layer, or the first buffer layer is formed by laminating at least two of the flexible PU layer, the PI layer and the PMMA layer; and   the second buffer layer is any one of the flexible PU layer, the PI layer and the PMMA layer, or the second buffer layer is formed by laminating at least two of the flexible PU layer, the PI layer and the PMMA layer.   
     
     
         11 . The display device according to  claim 6 , wherein in a direction perpendicular to the first surface, a thickness of the first buffer layer ranges from 5 μm to 40 μm, and a thickness of the second buffer layer ranges from 5 μm to 40 μm. 
     
     
         12 . The display device according to  claim 6 , wherein the first elastic layer is a thermoplastic polyurethane (TPU) layer. 
     
     
         13 . The display device according to  claim 6 , wherein the first support layer is a polyethylene terephthalate (PET) layer.